Apparatus and method for power saving using requantization in baseband modem

Abstract

In the power saving, a method for saving power at a receiver of a mobile communication system includes acquiring Carrier to Interference plus Noise Ratio (CINR) and Modulation and Coding Scheme (MCS) information required by the receiver; determining the number of Least Significant Bits (LSBs) to hold based on the CINR and MCS information; and holding LSBs of the determined number of the bits in received information.

1 . A method for saving power at a receiver of a mobile communication system, the method comprising:
 acquiring Carrier to Interference plus Noise Ratio (CINR) and Modulation and Coding Scheme (MCS) information required by the receiver;   determining the number of Least Significant Bits (LSBs) to hold based on the CINR and MCS information; and   holding LSBs of the determined number of the bits in received information.   
     
     
         2 . The method of  claim 1 , further comprising:
 outputting the information with the held LSBs to a decoder.   
     
     
         3 . The method of  claim 1 , wherein the holding of the LSBs of the determined number of the bits in the received information comprises:
 providing the LSBs of the determined number of the bits to an RX filter, a Fast Fourier Transform (FFT), an equalizer, and a demapper; and   requantizing, at the RX filter, the FFT, the equalizer, and the demapper, the received information as many as the number of the LSB bits to hold.   
     
     
         4 . An apparatus of a receiver which saves power in a mobile communication system, the apparatus comprising:
 a quantization level controller for acquiring CINR and MCS information required by the receiver and determining the number of LSBs to hold based on the CINR and MCS information; and   a reception part for holding LSBs of the determined number of the bits in received information.   
     
     
         5 . The apparatus of  claim 4 , wherein the reception part outputs the information with the held LSBs to a decoder. 
     
     
         6 . The apparatus of  claim 4 , wherein the reception part comprises:
 an RX filter, an FFT, an equalizer, and a demapper for receiving the LSBs of the determined number of the bits and holding the LSBs of the determined number of the bits with respect to the received information by requantizing the received information as many as the number of the LSB bits to hold using an internal bit holding MUX.   
     
     
         7 . A communication system for saving power in a mobile communication system, comprising:
 a transmitter for transmitting information; and   a receiver for acquiring CINR and MCS information required by the receiver, determining the number of LSBs to hold based on the CINR and MCS information, and holding LSBs of the determined number of the bits in received information.   
     
     
         8 . The communication system of  claim 7 , wherein the receiver comprises:
 an RX filter, an FFT, an equalizer, and a demapper for receiving the LSBs of the determined number of the bits and holding the LSBs of the determined number of the bits with respect to the received information by requantizing the received information as many as the number of the LSB bits to hold using an internal bit holding MUX.